Pretrituradora or predesmenuzadora consisting essentially of at least one drive assembly (1) including a motor of hydraulic or electric (2) drive and a gearbox (3) and at least one comminution (4) attached to the gear, and mounted on a frame (5), a wall, a feed channel or other support, characterized in that the gearbox (3) of the impeller assembly (1) of this pretrituradora or predesmenuzadora determines a fixing element and supporting at least one element comminution (4) and it consists of a fixed part (3 '), fixed directly on the frame (5) of the pretrituradora or predesmenuzadora or on a support or a wall of the latter, and a movable part (3 ") the element comminution (4) on the movable part (3 ") of the gearbox (3) being fixed and being guided and secured on the frame (5) directly by the gearbox (3) of the impeller assembly (1), it is responsible for the functions of supporting and guiding Sunflower or comminuting element (4).
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